Litter box



FIG. 1 is a perspective, front and side view of the litter box;

FIG. 2 is a front view of the litter box;

FIG. 3 is a rear view of the litter box;

FIG. 4 is a left side view of the litter box;

FIG. 5 is a right side view of the litter box;

FIG. 6 is a top plan view of the litter box; and,

FIG. 7 is a bottom view of the litter box.

The dot-dash lines in the drawings illustrate contours of the litter box that form no part of the claimed design. 

CLAIM The ornamental design for a litter box, as shown and described. 